mirror of
https://github.com/irmen/prog8.git
synced 2024-05-29 01:41:32 +00:00
114 lines
3.0 KiB
Lua
114 lines
3.0 KiB
Lua
%import syslib
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%import textio
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%import math
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%zeropage basicsafe
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; converted from plasma test program for cc65.
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; which is (w)2001 by groepaz/hitmen
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;
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; Cleanup and porting to C by Ullrich von Bassewitz.
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; See https://github.com/cc65/cc65/tree/master/samples/cbm/plasma.c
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;
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; Optimized and Converted to prog8 by Irmen de Jong.
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main {
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const uword VERA_CHARSET = $f000 ; $1f000
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const uword VERA_TXTSCREEN = $b000 ; %1b000
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sub start() {
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txt.color(6)
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txt.clear_screen()
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makechar()
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uword frames = 0
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cbm.SETTIM(0,0,0)
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do {
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; sys.waitvsync()
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doplasma()
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frames ++
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void, cx16.r0L = cbm.GETIN()
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} until cx16.r0L!=0
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uword jiffies = cbm.RDTIM16()
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; restore screen and displays stats
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cx16.screen_set_charset(2, 0)
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txt.color(7)
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txt.clear_screen()
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txt.print("time in jiffies: ")
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txt.print_uw(jiffies)
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txt.print("\nframes: ")
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txt.print_uw(frames)
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uword fps = (frames*60)/jiffies
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txt.print("\nfps: ")
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txt.print_uw(fps)
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txt.nl()
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}
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; several variables outside of doplasma to make them retain their value
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ubyte c1A
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ubyte c1B
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ubyte c2A
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ubyte c2B
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sub doplasma() {
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ubyte[txt.DEFAULT_WIDTH] xbuf
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ubyte[txt.DEFAULT_HEIGHT] ybuf
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ubyte c1a = c1A
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ubyte c1b = c1B
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ubyte c2a = c2A
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ubyte c2b = c2B
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ubyte @zp x
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ubyte @zp y
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for y in 0 to txt.DEFAULT_HEIGHT-1 {
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ybuf[y] = math.sin8u(c1a) + math.sin8u(c1b)
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c1a += 2
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c1b += 5
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}
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c1A += 3
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c1B -= 5
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for x in 0 to txt.DEFAULT_WIDTH-1 {
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xbuf[x] = math.sin8u(c2a) + math.sin8u(c2b)
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c2a += 4
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c2b += 1
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}
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c2A += 2
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c2B -= 3
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; sys.waitvsync() ; if you put this in it will run at 30 fps synced which looks really nice and smooth
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; use vera auto increment writes to avoid slow txt.setchr(x, y, xbuf[x] + ybuf[y])
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for y in 0 to txt.DEFAULT_HEIGHT-1 {
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cx16.vaddr_autoincr(1, VERA_TXTSCREEN + y*$0100, 0, 2)
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ubyte @zp yvalue = ybuf[y]
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for x in 0 to txt.DEFAULT_WIDTH-1 {
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cx16.VERA_DATA0 = xbuf[x] + yvalue
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}
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}
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}
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sub makechar() {
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ubyte[8] bittab = [ $01, $02, $04, $08, $10, $20, $40, $80 ]
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ubyte c
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cx16.vaddr_autoincr(1, VERA_CHARSET, 0, 1)
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for c in 0 to 255 {
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ubyte @zp s = math.sin8u(c) ; chance
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ubyte i
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; for all the pixels in the 8x8 character grid, determine (with a rnd chance) if they should be on or off
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for i in 0 to 7 {
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ubyte b=0
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ubyte @zp ii
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for ii in 0 to 7 {
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if math.rnd() > s
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b |= bittab[ii]
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}
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cx16.VERA_DATA0 = b
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}
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}
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}
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}
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